The expected return value from ion_map_kernel is an ERR_PTR. The error path for a vmalloc failure currently just returns NULL, triggering a warning in ion_buffer_kmap_get. Encode the vmalloc failure as an ERR_PTR.

Reported-by: syzbot+55b1d9f811650de944c6@syzkaller.appspotmail.com Signed-off-by: Laura Abbott labbott@redhat.com --- drivers/staging/android/ion/ion_heap.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/android/ion/ion_heap.c b/drivers/staging/android/ion/ion_heap.c index 772dad65396e..f32c12439eee 100644 --- a/drivers/staging/android/ion/ion_heap.c +++ b/drivers/staging/android/ion/ion_heap.c @@ -29,7 +29,7 @@ void *ion_heap_map_kernel(struct ion_heap *heap, struct page **tmp = pages;

if (!pages) - return NULL; + return ERR_PTR(-ENOMEM);

if (buffer->flags & ION_FLAG_CACHED) pgprot = PAGE_KERNEL;